Basic Operations

Calculator Assignment:

• Create a new file and write the code that will do the following:
  • Ask the user to enter two integer numbers (Use while loops to ensure that they are between 1 and 500 or some other range)
  • Have the computer calculate and display the following:
    • Addition
    • Subtraction (2 equations)
    • Multiplication
    • Division
      • Regular Division - float answer (2 equations)
      • Integer and Modulus (remainder) division - Integer answers (2 equations) - (Hint: use x%y) ... type casting may be needed
    • Square each number
      
      • use x**y such as x**2
      • use pow(x, 2)
        
    • Cube each number
      • use x**y such as x**3
      • use pow(x, 3)

 

• Consider ways to complicate this program. Here are some possibilities:
  • Questions that involve BEDMAS / Order of Operations
    • take a number, multiply by three and then add four
    • take a number, add four and then multiply by three.
  • Enter any base and exponent
  • Other operations: square root, cube root, trigonometric functions, factorial, etc._
  • Compare the numbers and display whether it is true or false
  • Mathematical equations (area, perimeter, volume, etc)
  • Try making a calculator.
    • ​Ask for two numbers and then provide a menu that allows the user to decide which of the operations they want to perform.
    • Could also provide an "all" option
    • What about if they want to do another calculation. Is it with the same two numbers or with different numbers.

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While loops

A WHILE loop is a way of repeating a section of code. We often use it to control allowable input.

Method 1: using True
- the problem here is what is "true"

Method 2: Using condition statements

while True:
      num1 = int(input("Enter a number > 10: "))
      if (num1 <= 10):
            print ("Please follow instructions.")
      else:
            ​break

​num1 = int(input("Enter a number > 10: "))

​# Error Loop
while (num1 <= 10):
       print ("Please follow instructions.")
       ​num1 = int(input("Enter a number > 10: "))

Python Arithmetic Operations

Python Assignment Operators

Arithmetic operators are used with numeric values to perform common mathematical operations:

Assignment operators are used to assign values to variables:

​Python Comparison Operators

Comparison operators are used to compare two values:

Python Logical Operators

Logical operators are used to combine conditional statements:

Note:

• Instead of "or" you can use "|" ... the line above the \ on the keyboard
  • (x<5) or (x>10)   is the same as   (x<5) | (x>10)
  • other languages use "||" .... (x<5) | | (x>10)
• ​Instead of "and" you can use "&" ... above the 7 on the keyboard
  • (x<50) and (x>10)   is the same as   (x<50) & (x>10)
  • other languages use "||" .... (x<50) && (x>10)
• Many languages use the "!" to replace "not"